Thread: speedometer

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I have an 700r4 tranny with electric sending unit on the tail shaft. I'm about to buy a gauge set and I'm wondering how difficult it will be to wire up the speedometer ? Also I'm wondering if I can just bolt on an manual speedometer cable fitting vice the sending unit that's currently bolted into the tail shaft and run manual speedometer ?

thanks for the feed back !!

I'm running an AutoMeter electric and will buy one again. Easy install, easy calibration. I wouldn't consider a cable driven unit, and having to mess with trying to get the right drive and driven gears in the tranny to give you the right cable rpm at 60mph based on your rear gears and tire size. Electric is so much easier, and they can be re-calibrated in five minutes or less if you change tire size, or rear gears. My $0.02 and others may disagree.

Originally Posted by rspears

I'm running an AutoMeter electric and will buy one again. Easy install, easy calibration. I wouldn't consider a cable driven unit, and having to mess with trying to get the right drive and driven gears in the tranny to give you the right cable rpm at 60mph based on your rear gears and tire size. Electric is so much easier, and they can be re-calibrated in five minutes or less if you change tire size, or rear gears. My $0.02 and others may disagree.

Roger: Can you tell me a lttle about how its works, as in the wiring? Is there a need for 12 vdc at the trans or is just in the speedo unit itself ? Just a direct plug between the sender and the speedo ? No ecm required right ? I want to go with the electric just for the things you mentioned.
thanks for your input !

Originally Posted by Navy7797

Roger: Can you tell me a lttle about how its works, as in the wiring? Is there a need for 12 vdc at the trans or is just in the speedo unit itself ? Just a direct plug between the sender and the speedo ? No ecm required right ? I want to go with the electric just for the things you mentioned.
thanks for your input !

Navy,
The AutoMeter instructions walk you through all of the details - http://www.autometer.com/productPDF/1164.pdf Most OEM speed senders are a two wire sine wave device, and one wire is grounded, while the other is the signal to the speedometer. The power wires to the speedometer, not to the tranny. The reference to "output to PCM" that you see is for modern cars that require a speed input to the car's computer. If you run into problems AutoMeter has all of the different sending units available that you might need, but I'm confident that the OEM sender will work fine. As a fall back, the AutoMeter techs are great to deal with. My tach went erratic after about a year, and after talking to them we agreed that they needed it for diagnostics. I got a brand new one by return and have had no problems with any of the gauges since.

I also like the electric Speedos but I'm really leaning towards a GPS Speedo for the 40. They're a little more expensive by have some nice extra features.